Nice to see new features :-)
I've only briefly looked as example source, didn't play with it but noticed that it BT part detects my android phone, so few questions emerged:
is this bluetooth feature restricted in any way or it just pure bt interface that can be used in any way and does it have some special hardware requirements like Bluetooth v 4.0 or whatever?
My two cents on mouse wheel, whatever are system hardware specifications, differences and changes between their API updates those functions should give consistent, same kind of results in GLB, will it be integer range like -120 to 120, or float -1.0 to 1.0 it's secondary matter, just one type/range for all systems.
Camera usage can be interesting for some projects..